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I tried copying the Windows Fonts folder into $HOME/.fonts and run fc-cache -f -v but even so Seamonkey still failed to display CJK characters. What should I do now? 
And your $HOME = /root, correct?
If so, it's because browsers in Fatdog run by default as an unpriviledged user spot, which can't access /root/.fonts dir, its $HOME is /home/spot.
So, move them from /root/.fonts to /root/Fonts, which is a symlink to /usr/share/fonts/X11/TTF, then click the Update-Fonts script and they'll be globally accessible (you may need to restart SM after that).
Also, you may want to check this:
viewtopic.php?p=8955#p8955
Greetings!